Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8a3f1bc9c88750…

MALICIOUS

PDF

76.9 KB Created: 2021-04-02 22:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a53e3b5524ac660888746dd7b02c6274 SHA-1: dfba92c707fce970504d0d5487c715d750f2f877 SHA-256: 9f8a3f1bc9c887500375ef45f70e39fb44e494aa1fb4ac90122600bf2c2bac5d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of link farms on disposable hosting, reinforcing the malicious nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=silver+eyeshadow+meme PDF link annotation
    • http://boldly-grow.com/782326468jzbiv.pdfIn PDF document text
    • http://conicppjry.bid/rimworld_tech_level_increasejtvpz.pdfIn PDF document text
    • http://sopafekidis.sportsontheweb.net/10245510023.pdfIn PDF document text
    • http://roskycnmx.com/cytus_2_miku_apkjk5lp.pdfIn PDF document text
    • http://xugilerasifoveg.22web.org/72932483135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabafurulevu.epizy.com/29231087005.pdfIn PDF document text
    • http://xufizup.rf.gd/deadliest_tornadoes_nova_worksheet.pdfIn PDF document text
    • http://vewomani.rf.gd/english_stories_for.pdfIn PDF document text
    • http://sulegezusaz.epizy.com/types_of_audio_amplifiers.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/nys_biennial_statement_paper_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15229374-2ee6-4113-95df-b0023e2e702b/susan_sontag_on_photography_chapter_summary.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_5609eb2999ad4a6193839d286a307af8.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_73e2b067a44e426e8cbd13f0e77e3f8b.pdf?index=trueIn PDF document text
    • http://kilarosine.atwebpages.com/97892307318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64158928-66ce-4404-bbb6-646780165d68/jutaxerazobufiwovuxavu.pdfIn PDF document text
    • http://tetojijiwul.epizy.com/dowagolubesuziniziz.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/ventajas_de_las_energias_renovables.pdfIn PDF document text
    • http://mokatelizomopi.rf.gd/african_culture_book.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 5424 bytes
SHA-256: 9505a97e0e7f00d3d13a3619b7aae454de80242d6da2c904a86af4d6728fdfd8
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 11584 bytes
SHA-256: 67afaca2985dd07180a685463560405ffafee61c24ecde72cb003d1d6cb38006

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